AftertreatmentCaterpillar Diesel ECM

E1026

Name: ECM Performance
Address: Fort Lauderdale, FL, 33325, US
Telephone: (888) 768-2447
Price range: $$-$$$

DPF, DEF, SCR, and NOx-reduction system faults.

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Caterpillar Aftertreatment

Caterpillar ECM Service

Diagnostic Overview

CAT event code E1026 should be verified in Cat ET or SIS for the exact engine and emissions package. As listed under aftertreatment, it should be treated as an aftertreatment operating event rather than a simple standalone sensor fault. The event may be triggered by DPF, SCR, ARD, regeneration, or sensor conditions depending on calibration. The correct next step is to read the full event description and look for supporting active SPN/FMI codes.

Likely Causes

Calibration-specific aftertreatment event; regeneration issue; DPF soot or restriction; ARD performance issue; DEF/SCR performance issue; sensor rationality problem.

What To Check First

Open the event in Cat ET, record occurrence count and active status, review related SPN/FMI codes, and check aftertreatment live data before replacing components.

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Related Aftertreatment Fault Codes

View All Aftertreatment Codes

SPN 1761 FMI 17

CAT fault code 1761-17 commonly relates to diesel exhaust fluid level or a DEF level signal that is below the expected range.

SPN 3360 / SPN 3820

CAT codes listed as 3360/3820 generally point toward the DEF supply, DEF quality, DEF tank, or SCR dosing system depending on the exact FMI shown in Cat ET.

SPN 3361 / SPN 3821

CAT codes listed as 3361/3821 commonly belong to the DEF dosing or SCR control side of the aftertreatment system.

SPN 3474 FMI 31

CAT fault code 3474-31 is typically associated with aftertreatment regeneration or ARD-related operation.

SPN 3701 FMI 15

CAT fault code 3701-15 commonly indicates an aftertreatment condition that is above normal but at a least-severe level, often connected with DPF soot load, regeneration need, or aftertreatment restriction.

SPN 3701 FMI 16

CAT fault code 3701-16 usually represents a more serious aftertreatment condition than 3701-15, with the measured or calculated value above normal at a moderate severity level.

View All Aftertreatment Codes →